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1、//^:^^#^~^^"#@::"~^$:~@""#:$@^"*^~@~$"~~""^^:@^^:#^~~\AMERICANNATIONALSTANDARDANSI/ISA-5.1-2009InstrumentationSymbolsandIdentificationApproved18September2009--`,,```,,,,````-`-`,,`,,`,`,,`---CopyrightInternationalSocietyofAutomationProvidedbyIHSunder
2、licensewithISANoreproductionornetworkingpermittedwithoutlicensefromIHSNotforResaleANSI/ISA-5.1-2009,InstrumentationSymbolsandIdentificationISBN:978-1-936007-29-5//^:^^#^~^^"#@::"~^$:~@""#:$@^"*^~@~$"~~""^^:@^^:#^~~\Copyright©2009byISA.Allrightsreserv
3、ed.Notforresale.PrintedintheUnitedStatesofAmerica.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmittedinanyformorbyanymeans(electronic,mechanical,photocopying,recording,orotherwise),withoutthepriorwrittenpermissionofthePublish
4、er.ISA67AlexanderDriveP.O.Box12277ResearchTrianglePark,NorthCarolina,27709USA--`,,```,,,,````-`-`,,`,,`,`,,`---CopyrightInternationalSocietyofAutomationProvidedbyIHSunderlicensewithISANoreproductionornetworkingpermittedwithoutlicensefromIHSNotforResal
5、e-3-ANSI/ISA-5.1-2009Preface(informative)ThisprefaceisincludedforinformationpurposesandisnotpartofANSI/ISA-5.1-2009.ThisstandardhasbeenpreparedaspartoftheserviceofISA,TheInternationalSocietyofAutomation,towardthegoalofuniformityinthefieldofindustriala
6、utomation.Tobeofcontinuingvalue,thisstandardshouldnotbestaticbutshouldbesubjecttoperiodicreview.ISAwelcomesallcommentsandsuggestionsandasksthattheybeaddressedtotheSecretary,StandardsandPracticesBoard;ISA;67//^:^^#^~^^"#@::"~^$:~@""#:$@^"*^~@~$"~~""^^:
7、@^^:#^~~\AlexanderDrive;P.O.Box12277;ResearchTrianglePark,NC27709;Telephone:(919)549-8411;Fax:(919)549-8288,e-mail:standards@isa.org.TheISAStandardsandPracticesDepartmentisawareofthegrowingneedforattentiontothemetricsystemofunitsingeneral,andtheInter
8、nationalSystemofUnits(SI)inparticular,inthepreparationofinstrumentationstandards.TheDepartmentwillendeavortointroduceSI-acceptablemetricunitsinallnewandrevisedstandards,recommendedpractices,andtechnicalreportstothegreatestextentpossible.Standa
